Microprocessor Controlled Multiband Transceiver

Sl6440 Mixer

Who says building your own full-featured transceiver is a thing of the past By Tim Ahrens, WA5VQK, and Rand Gray, W1GXN Since our early novice days we have always wanted to build a really substantial project but seemed to fall a bit short most every time, with super-regens that kinda worked and false starts on multiband rigs through the years. Most of the plans were from QST and the Handbook, but either funds ran out or enthusiasm waned before the project was complete. It seems that things were...

Aea Wm-30 Swr Power Meter

1998 Electrical Meters

Tempo Research Corporation 1221 Liberty Way Vista CA 920X3 760 598-8900 FAX 760 598-4898 AEA sold a variety of produc s over its 20-year history. Timewave cannot repair most of ihe non-data products because they have few spare pans, but they may have technical data on those products. Their working knowledge of the non-data products usually vs ii I be quite limited. Please inquire about specific products. In particular, the antenna tuner products, the LA-30 linear amplifier and the WM-30 SWR...

Heath Company

Precision-built Linear Master Oscillator (LMO) 5 completely assembled and calibrated, ready lo install specialty designed dial assures accurate readout and smooth frequency control, PrebuMl. hermetically-sealed 2A kc crystal bandpass filter for SSB provides the excellent nominal snape-tactor of (60,6 dfr), Optional AM and CW tillers shown Installed. Precision-built Linear Master Oscillator (LMO) 5 completely assembled and calibrated, ready lo install specialty designed dial assures accurate...

Heathkit Catalog

See the wide array of Heath-kit Amateur Radio Equipment available at tremendous da-it-yourself savings Everything you need n mobite or fixed station gear with full descriptions and specifications Send far Free copy Heath Deluxe SB-Series LMO (Linear Master Oscillator) with features factory built into the heart of every SB-300 and SB-400 features you can prove for yourself True linear tuning . . . (within 400 cpsi Stable Jess than 100 cps per hour maximum drift after warmup Tuning repeatability...

Baw Viewstar Antenna Tuner

Network Antenna Tuner Plans

Hfjil HC3 HC4 KC5 Stock HelB iaBoamMik heads l 53 95 CSI Pr vale Paich III . 469 95 FLUKE 77 auto-ranging digrtai qfcilimeier 125 00 B d 43 Wattmete Call Bird Elements H 59 00 A E 48 00 tn Slock Darwa CN62QS 20 200 20QQW 109 95 L gt ,i gt z CN630 140-450 20 20DW 129 00 Stabytex 20SR. 25 amp 12VDC, 16ampc OL over vo tage protected -99 00 Alineo ELM 2300 F . relent buy 00 Nye MS5 A for the tig boys 529 00 W. jhl 7470 Soldering Station .49 00 Kenwood IF 10A, B, C, Stock Kenwood IF 232C I evel...

Lts Transverter

The 1296-MHz amateur pand, 01 23 centimeters is is frequency called has long been a dark mystery to most amateurs. The log'strcs of gett-ng something Q oscillate ai lhat frequency in j siabie manner. as well as amplifying he resultant signal and modulating II. have served Co discourage all but the most technically competent amateurs from ever operating n the band Add the problems of designing .i high-gain, low-noise front and. and the diltlcullies of getting all of Ihis stuff to worn with piles...

Bench Tested

AMERITRON I BUTTEftNUT LAR5EN 8 WEU i NYE VIKING I MIRAGE HANTRONICS coteague effort which we also used again during the CO WPX. As I mentioned in my review last year, the 1271A really needs some sort of preamp in front of it, and the AG1200S makes all the difference in the world. It's neat having a complete 23 cm station all by itself in one package. One drawback The AG1200S is only rated for 15 Watts maximum power capacity in a mast-mourned application In my case, that meant running the...

The type a vacuumtube voltmeter

A portable battery-operated instrument Instruments . . . 7 Service Notes Errata 8 FOR A LONG TIME there has been need for a general purpose vacuum-tube voltmeter which was battery operated and truly portable. The Type 726-A instrument, introduced in 1937, has filled the need for an instrument of the laboratory type where line power is available, but is often inconvenient for field work on account of its size Figure 1. View of the voltmeter with cover open. and the required line connection. The...

Commercial Cathoderay Oscillographs

We now are ready to consider the structure of the cathode-ray oscillographs offered for commercial use. Let it be known that it is our intention to discuss those devices which are being offered for use by the radio servicing industry for radio receiver design and servicing, public address design and servicing and to the amateur radio fraternity, for the adjustment of ham transmitters. There are in use a large number of cathode-ray units intended for the industrial field and college...

Sako Hasegawa

Founder, Chairman of the Board Yaesu Musen Co., Ltd, Tokyo, Japan As an electronic engineer and amateur radio experimenter. Mr. Hasegawa introduced Single Sideband Radio telephony to amateur hands in Japan in 1956. He constructed SSB generators based on the works of his contemporaries in the US, and soon had many requests for complete transmitters and receivers, in 1959 he incorporated Yaesu Musen C&, Ltd. to meet the demand far this equipment. From iiis inspiration and under his guidance, the...

Mfj624 Phone Patch Circuit

Radio Telepatch

Took less than one hour to make the conversion and get the ten-meter rig on frequency A few modifications are available in the conversion kit that can be left out mainly, the frequency expansion switches that allow a full one-megacycle coverage. By selecting the correct set of crystals in the kit, the Pace can be put on the frequency you have selected without the addition of the switches and cabling. American Crystal also recommends a modification that allows the clarifier to move the...

Multi Band Qrp Transceiver

Qrp Multiband Transceiver

Robart S, Capon W3DX formerly WA3ULH 107 Cavalier Drive Charlottesville VA 22901 old Northern California QRP Club NorCal ean be used as an indicator, interest in QRP kit-building is making a strong comeback. This year NorCal membership quietly zoomed past members. One of the key reasons for this enthusiasm in NorCal is the scries ot innovative QRP kits designed by Wayne Burdick N6KR, made available to club members by NorCal and to the general puhlic by Wilderness Radio, These kits have included...

Thereby forming what is known as a ring type shunt the

Calentamiento Especifico Para Circuitos

Total ring resistance value being 375 ohms. The resistance values of the 75 ohm shunt resistors are determined by multiplying the total ring resistance by the full scale current of the meter, dividing the result by each range value, in turn, from the common terminal, and subtracting the sum of the preceding values from each newly-determined value. When the ring value of 375 ohms is multiplied by the full scale sensitivity value of 0.001 ampere, 0.375 is the result, into which each range value...

International Crystal

International Crystal Oscillator

Since I have been building some kind of solid-stale unit such as an i-f amplifier, an rf power stage, a solid-state X-band oscillator, etc., at an average of about one a week, I appreciate an organization that is marketing kits for us amateurs in a sensible fashion. Frankly the prices don't appear sensible, being much, much too low For 2,95 you get a complete crystal oscillator kit 3 60 MHz . You doni get the crystal at that price, but you do get the transistor, and the oscillator works right...

Volume Control Methods

Radio Volume

Since the signals intercepted by an antenna may be of widely differing strengths, the receiver should be able to handle both weak and strong signals. It is advantageous to bring both the very weak signal and the very strong signal to approximately the same level of strength for the final reproduction of the intelligence. The process of matching signal strength to desired audio output involves the use of volume controls. Three methods are in common usage manual control of audio signal, manual...

This new lowcost radiant flux meter system gives direct radiometric measurements in the infrared visible and

8330a Radiant Flux Meter

Mellon Optical measurement is one of the oldest and most fundamental areas of science, yet it's still one of the least mature. Optical energy is generally considered to be the portion of the electromagnetic spectrum between microwave and x-ray frequencies. Measurements in this region are a separate area of science because optical sources, detectors, and techniques differ markedly from those used in the microwave or x-ray regions of the spectrum. Within the...

The Hardware

5035t Logic Lab

Logic lab hardware consists of the mainframe, an assortment of 32 integrated circuits, pre-stripped Fig. 1. Model 5035T Logic Lab includes everything needed to train newcomers to digital integrated circuits hardware, textbook, laboratory workbook, and all parts and troubleshooting tools. Fig. 1. Model 5035T Logic Lab includes everything needed to train newcomers to digital integrated circuits hardware, textbook, laboratory workbook, and all parts and troubleshooting tools. wires for circuit...

Fm Squelch Schema

Fig, 72 Coi wcf ofi of npi f of rto digital COR to the squelch circuit of the repeater receiver. lt circuit shown is a portion from a Motorola G-strip receiver 77 f co wecWo j point wilt be similar in othet types of tube receivers. I Simple 5 uo regulated power supply. commcrcial FM receivers the grid of the first stage following the noise rectifier has this characteristic. A simplified sketch of the squelch circuit of a typical tube-type receiver and 1 he correct point of connection to the COR...

World Radio Laboratories Council Bluffs Iowa

1963 Ham Radios

World Radio Laboratories 3415 West Broadway Council Bluffs, Iowa The PSA-63 is an ac power supply to power any 50*100 watt transmitter or transceiver. 600 vdc, 300 vdc, or combination to 210 watts. 6 or 12 volt filament windings, 95 volt bias winding. Less cabinet, accessory kits available to modify for use with various rigs. Size 4 > 4 h, 6 d, 11 w. Weight 15 lbs, Price Kit 24.95, Wired 39.95. The Galaxy 300 is a 200 watt lJEP SSB transmitter for the phone sections mi 8u, 40 and 20 meters,...

1152 Cavity Oscillator Hamradio

100 , but a fair amount sure seems to clean things upl On some APX-6 models, you will still need to carefully remove a bit from the transmitter cavity plunger On one of mine, I did not have to do anything but tune On the other, it required trimming, but someone else did it for me on a lathe , so I suggest you obtain copies of the articles in the bibliography and digest them well before chopping away, he modification of the cavity plunger would make an article in itself as it did several times...

Collins R

1 have been selling Collins Communications Receivers for better than ten years. Because my standards are very high, I had to price these sets at proportionately high levels and relatively few are aware of my service in this field. offer for sale the finest variety of the best communications equipment available in the United States, and in quantity. My prices vary from about 400 for a poor grade R388 to almost 2000 for the best grade R391 gt These receivers are all built around Collins...

Faster Than A Patch

Not Disturb Circuit Diagram

Dial home while driving by simply pushing a single button on the microphone. Craig Oichton K7UKW 2540 Esst 12th Street The Dalbs OR 97058 Its Friday afternoon You're caught in heavy rush-hour traffic. You're going to be late getting home. It would be nice to punch up the patch and advise your wife to adjust dinner time, but do yon dare risk dialing in this traffic Sure If your rig is equipped with thh speed-dial circuit, your eyes never have to feave the road This article describe* circuitry...

Gregory Electronics Corp

The FM Used Equipment People 243 Route 46, Saddle Brook, N. J. 07662 14 case less accessories amp ovens 6 12 volts, 30 watts, vibrator power supply Accessories available for each of above units Just Arrived General electric Message Mates High Band G.E. PROGRESS LINE STRIPS physically complete, but sold on an as-is basis only less vibrator_J20__ __S20__ __S20 less vibrator__ 25__ __ 25__ Jess final tubes 18 25 25 30 12 Note MA E42 wide band_____ 14 Progress Line Case, consisting of front basket...

Kasara Microsystems

Newly released from Kasara Microsystems is the Commodore Diagnostician It allows the average Commodore computer user to diagnose and fix their machine when it's broken 95 of the time. The Diagnostician is inexpensive and would certainly be of value to The ham operator. It sells for 7 plus 1 shipping and handling (Oiher Diagnosticians to be released soon IBM Diagnostician. 1 and 2.) For further information contact Kasara Microsystems, 33 Murray Hill Drive. Spring Valley NY 10977 Commodore...

Ace Communications

Also new from AOR is a 25-oz. mobile scanner, model AR160, The receiver covers 29-52 MHzh 136-174 MHz, and 436-512 MHz. It includes a fused DC power cable, telescopic whip antenna, mobile mounting bracket with hardware, and an AC to DC converter for indoor use. A battery retains the memory if power fails. Also included is LED display, 20-key access to the microcomupter, and high receptivity for only 189. Ace Communications will handle product marketing and service through their Monitor Division...

Dse Field Strength Meter

Ham Radio Field Strength Meter Schematic

Dick Smith Electronics Inc has announced a new field strength meter kit. The field strength meter is buiti on a smalt PCB that mounts directly on the meter terminals. Only the sensitivity pot and power switch are offboard. The telescopic antenna mounts via a small right-angle bracket which bolts to the board The case provides additional support for the antenna via a grom-meted hole in the case top. The DSE field strength meter is priced at 39.95 plus 3,50 shipping and handling. For more...

Look At The Signal Enhancer

In the fifties and sixties, the best way to improve receiver selectivity at tow cost was to add one of the outboard devices popular then, such as a Q-multi-plier which worked on the set's t-f stages or a war surplus radio range filter which was inserted in the set s headphone lead Both methods left a lot to be desired. It seems that suddenly hams have discovered that the easi est and in some ways, most cost-effective way of improving receiver selectivity is to add an outboard audio fitter The...

VHF Log Periodics and the Tog Scan

If you have been planning an antenna system for the VHF or UHF bands, you shouldn't overlook the log-peri odic array. Th is antenna features high gain, wide bandwi dth and reproduceabili y. The new look in antennas is here. Soon VHF log-periodic antennas will l gt e replacing vagi arrays of practically ail types, and also replacing old standbys such as the collinear, helix, and corner reflector. This revolution has already been taking place in the television antenna business for several years...

Sw-7800 Schematic

Heathkit 7800

I've been a ham now for almost 25 years There's a let of enjoyment goiten from Talking to new and old fnends on the ham Dands However as with any other hobby, a person craves to branch out and expand his or her horizons In my case, J thought It was Lime to Iry shortwave listening again as I had when I first started out. Since all my old shortwave gear Is long gone, I needed something new to gel back into generai-coverage receiving while at the same lime noi spending a smaif fortune. Heath's...

Variable Reciever Bandspreading

An RF coil, such as the one shown on page 10, is designed for minimum loss. It uses a multistrand wire called Litz wire. This wire is made by weaving together a large number of fine insulated wires. Its AC resistance is low, and therefore the Q of the coil is high. Very light cardboard is used for the coil form. The form is varnished both before and after winding, to prevent absorption of moisture. The physical size of coil and form is kept as small as possible. The width of the mass of wound...

Please Include Your Zip Code When You Write

Specializing in police and marine monitoring and transmitting equipment. All HF, FM, business units. Also ham gear and tower equipment. Below wholesale prices on many items with new factory warrantees. 5403 Grand Ave. Omaha, Nebr. 68104 402 451-6477 Since the last report, conventions and hamfesls have caused QRM and we missed the lust issue of the magazine. We now have a good system lined up, so my service to all of you wall be speedier and more efficient Remember . . ....

Polariscope For Dynamic Stress Analysis

Polariscope Stress Analysis

One of the more useful tools in mechanical research is the photoelastic polariscope for stress analysis. The science of photoelastic stress analysis is based on the property of certain transparent materials which causes them to exhibit, when strained, a degree of optical double-refraction exactly proportional to the net stress. Such materials, under stress, are no longer isotropic to light, a ray of which, entering such a stressed material, will travel faster in one plane than in the plane at...

Y Low Frequency Oscillator

RECENTLY the increased attention paid to the operation of - broadcast circuits at the lowest audible frequencies has created a demand for measuring equipment to cover this range. With this in view the General Radio Company has extended the frequency range of its Type 377 Low-Frequency Oscillator to include all frequencies lying between 25 cycles and 70,000 cycles. At the same time that this change was contemplated it was thought desirable to design the new oscillator for use with one particular...

An oscillator frequency control circuit

Frequency Control Component Circuit

How the Discriminator-Detector Circuit Works. The discriminator-detector network as the name implies, discriminates between applied intermediate frequencies which are too low and thpse which are too high, and produces a corresponding direct current or voltage whose polarity depends upon the direction of frequency departure from a prescribed intermediate frequency. This d.c. voltage is applied to a control element which in turn causes a shift in frequency of the local oscillator such as to bring...

Kenwood Ulsa Corporation

CA90810 P.O. Box 22745, Long Beach. CA 90801-5745 25 watts high 5 watts adjustable low Programmable scanning-memory, band, or mode scan wilh COM channel and priority alert 10 memory channels for frequency, mode. CTCSS tone, offset. Two chan nets for odd splits. All mode squelch, noise blanker and RIT Easy-to-read analog S amp RF meter MC-48 16-key DTMF hand microphone and microphone hook included Frequency lock, offset, reverse switches Digital Channel Link DCf_...

Antennas West

Kenwood 2500 Battery

SunFtex, a lightweight, durable, and flexible Sovonics solar battery charger, is available from Hal-Tronix. SunFlex is equipped with blocking diodes to prevent dis-ch arge of the battery at night or on cloudy days. MA-2, the most compact generator, can be plugged into a cigarette fighter. MA-3 maintains boat or RV batteries. The MA-5 can power portable ra Periphex has a new battery pack for the Kenwood TR-2500 3500 and the TR-2600A 3600A. dios, MA-10 gives standby power for deep discharge...

Mc With The Power On

The PC communication program should set the IBM PC serial port to 9600 bauds, no parity. When power is applied to the programmer, the programmer will then send the on line message to the PC. At this time, the user may enter any of the programmer commands. Table 1 is a list of the available commands. Commands are executed when the letter is sent to the programmer followed by the enter or cr character (the l, d, and m commands do not need the enter). Any character other than enter or cr stops...

Latest Howtobuild Data

The new 18th Edition of the famous Editors amp Engineers RADIO HANDBOOK presents complete design data on the latest transmitters, receivers, transceivers, amplifiers, and test equipment. Covers SSB design and equipment, RTTY circuits, and latest semiconductor- circuits, as well as IC Also includes coverage of r-f amplifiers, special circuits, and computers. All equipment described is of modern design, free of TVI problems, Provides a complete understanding of the theory and construction of all...

Video Switcher

W & 5 System Drj o Wesiinghous i * VCM 200 T The VCM-2001 video comrol module atfows you to record from H cable converter ar otiier program source while waicning regjiar TV or you can retara from TV whi 9 wafctLig cable o o her spuree To ho h-up and operate, the front panel has 3 soti-touch pushbuttons and LED indicators. Elim nales the need tor cumbersome atid ci ffident rr e' charicat A0 swilcnes and spitltjr 9 X 5 X 2An CAT u VCM-2 Q1 Si9 95 each

Book Clearance

Take a Chance itr f yi Catcula-tor (Uttnum publisher I *BK1002 ras S 95 now 4 50 Chemi hv j Computer E u cor r1 fuoiis -1 BKlOtO was S9 95. no* 5 00 Computer Dic onarv tCamelpt pubhShSFh *BK1Q1 * rj 5 95 no* S3 30 FORTRAN fj- iTun inQ ,Came lot pubJiSherk BK io i9 a as S7 95 r oyi. U 00 pubJtShefi 6M020 -wasS4 95 no* 2 50 a Quick Loot at 9ASIC iCameJot-pdDliSheri 0K1043 Aas 4 95 no* 52 50 how ro Bu1- anr UseMtms and v.-cros iSams publisher *as S9 35 no* S5 00 Ho* to Program Microcomputers Sams...

Cra Antenna From Comrad Industries

Ddr Antenna

Your first impression will be What is it The second may be fHow does it work 1' or Hey, that's sure different wonder what it's for My neighbors thought I had left a fancy dish on the top of the car, and my wife remarked that it looked like a flying saucer whatever they look like . To me, it looks like a directional discontinuity ring radiator, or DDRR., .which is exactly what it is, Okay, I guess I do owe you an explanation about the mystery, so let's take first things first. A few months ago...

Amp Solid State Relay

Ence frequencies which is applied to the programmable frequency divider, C4, via Q28 and Q29, programmed by leel switches to divide the relevant difference frequency from Q27 to provide a 10-kHz output which is applied to the phase comparator, IC5. Note, by the way, that the difference between the transmit and receive offset frequencies is 10.7 MHz, which is the required intermediate frequency. So far so good But now we have to backtrack a fittle There is a problem in that IC4 cannot precisely...

In Australia

Sue Thurgon

Here's a special report about the Twin Ciiics Radio and Electronics ClubT Inc. s Year 2000 hamfest held in the city of Albury, NSW, Australia. Through the ingenuity of All VK3CQE and John VK3LM, everything was arranged so thai W87XT in Cincinnati, OH, LISA, could view many live scenes with pictures and sound from the Twin Cities Hani lest in Albury. NSW. Australia, which occurred on August 13th, 2000, Voicc and pictures were made possible by utilizing VocalTec Phone 4.5, an Internet voice-video...

Hep 553 Transistor

When Allied Radio Shack sets out to build the two best buy receivers on the market, you expect a lot' And you get it A4-FETfront end with 0,5 uV sensitivity on SSB CW at 10 dB S N. Crystal controlled 1st oscillator and BFO for best US8 LSB CW, Pre-selector. 25 100 kHz calibrator. Dual conversion. Ceramic filter. AGC and ANL. Q-Multiplier. Concentric RF AF gain controls. Anti-backlash dial with J 00Hz visual readout. Dual 117VAC 12VDC supplies. And everything else you need for the DX you want....

Field Strength Meter Circuit Diagram

Save those transformers from old rotor control units. You'll find uses for them. One is a transistor power supply- With a bridge rectifier, you can get 30 volts plus at more than 30 ma. plus. , . . K0VQY UHF TV is gone for a lot of areas. There are UHF converters and probably old TV boosters also. A majority of these contain a transformer that delivers 6-3 volts and 125 volts at 30 ma-, that is isolated from the line. Preamps, bias supplies, small set supply and a load of test gear you can...

Meet the Marvelous Micro Vert

Is this the world's smallest vertical antenna Well, I'll admit that the Micro Vert's claim to this title has not been well researched. There might be a smaller 20-meter vertical antenna out there, but 1 11 be very surprised if there is The MicroVert measures in at an astonishing 20 inches tall and yet manages to cover the entire 20-meter band with an SWR no higher than 1.5 1. Amazing Maybe. Interesting Absolutely Imagine the response you will get from other stations as you describe your...

6aq5 Transmitter

The TV-502 transverter puts you on 2-melers the easy way. Simply plug it in to the TS-320 ior TS-520J and you're On the air Operates in the 144,0-145.7 MHz frequency range wiin a 145 0-146 0 MHz option Si Dunn K5JRN 3607 Binkiey Dallas TX 75205 ostal iLi can do funny things to a ham. Recently, I recalled the one tube transmitter that first got me on the air as a Novice hack in 1957. And before I knew it, i was doodling a schematic and looking through my junk box My first 6AQ5 oscillator was...

Ten-tec Corsair Ii

Margaret LtPage NIFBC operates the emergency packet station just after a New Hampshire snow storm, ft pays to be prepared. Photo J. Margaret LtPage NIFBC operates the emergency packet station just after a New Hampshire snow storm, ft pays to be prepared. Paper, logging forms, pencils, and erasers Atso take along manuals and'or command 'cheat sheets for all the equipment that's commonly used in the area in question. Photocopy the essential instructions out of manuals. In many emergency...

Michael Cowley Jack H Lepoff

Mike Cowley received his BS and MS degrees in electrical engineering from the University of Notre Dame in 1959 and 1961, respectively. In 1965 he received the Ph.D. degree in electrical engineering from Stanford University, where he was employed as a research assistant in quantum electronics. Before coming to hp associates in 1965, he taught electrical engineering for a year at the University of California at Santa Barbara, and worked as a consultant in physical electronics. Since joining hp...

Auhf Phone Sniffer Circuit Receiver

Regency Rh256b

Hie basic changes an in the diode strings, 20 73 Amateur Radio March, 1988 iM m Fi u re i The gt riginai t rcittt 2tKh the high voltage line increased about 300 volts, and power output increased by about 50 Watts, Users may exercise their own options to mount the pans required lo complete the modification, One method is to older the capacitors across the body of the diodes and to place the resistors to the foil side of the PC board. The 20Q resistor can be...

Radio Amateur

925 Sherwood Dr,, Box 24 7 Lake Bluff, I L 60044, USA same a* the FM voice repealers wc are used to. In fact, any packet station can be a digipeater. Remember thai each packet station listens to every transmission on the frequency to see if that transmission is addressed lo it. it also looks at each transmission to see if it is supposed to be repeated. The addressing information specifies which stations are lo repeat the information and in what order they are to repeat it. Thus a cham of...

MHz Synthesizer Joins The Family

The newest addition to the GR synthesizer line, the T vpk 1 164-A Coherent Decade Frequency Synthesizer Figure 1 , offers greatly expanded frequency coverage, extending well beyond the normal high-frequency, radio-communications bands and including the popular intermediate frequencies. All the features of the low-frequency models12' modular construction, in-line readout, provision for sweeping, continuously adjustable decade CAD , program-mability,3 ac and battery operation have been retained,...

Cushcraft R Half Wave Vertical

We all remember the old cliches about vertical antennas, but the problem is that most of them weren't true, I've used vertical antennas with good success over the years and have owned most of the brands on the market at one time or another. Oh sure, if you insisted on ground mounting your vertical, refused to place it in the clear, and just drove any old kind of ground rod into the soii instead of furnishing decent radials, you were disappointed, ,, and have only yourself to blame. On the other...

The Cathode Ray Oscillograph

Cathode Ray Oscilloscope Circuit Diagram

The cathode ray oscillograph is at present one of the most useful of radio testing devices. Although as yet relatively expensive, its applications are so numerous that it will readily replace a number of measuring instruments of more or less satisfactory characteristics. A few of the more important applications of the instrument are the study of wave shapes and transients, measurements of modulation and peak voltages, adjustment of radio receivers, comparison of frequencies, the indication of...

Eico Transceiver

Eico Transmitter

FULL 3-BAND COVERAGE, 80-40-20, SSB, CW AND AM What Ham wants to be limited to one mode of transmission when he can have all three Or limited to PTT when he can have both PTT and VOX Or limited to spot frequency operation when he can have 10-Kc, offset tuning each way from the transmitter frequency These features, plus many more, make the Eico 753 a very satisfactory package for the Ham who wants the best, and at roll-your-own prices. Although the modern sideband transceiver is a very...

Galvanometer is used r the radius of the coil in centimeter

Tangent Galvanometer Diagram With Parts

6, the angle of the needle deflection in degrees and I, the current in c.g.s. units. FIG. 1 The tangent galvanometer consists essentially of a short magnetic needle suspended at the center of a coil of large diameter and small cross-section. In practice the diameter of the coil is approximately 17 times the length of the needle. If the instrument be so placed, that when there is no current in the coil, the suspended magnet lies in the plane of the coil, that is, if the plane of the coil be set...

Lafayette 99 90375

MODULATOR-LAFAYETTE CAT NO. 99E9037& + 9V CJ -32 oF Rl-470 TO Itct for desirtd voice I*ve0 C2 - SO DF OSt-iNT XTAL OX SERIES HI FREQ. LI- 10T MO. 22 AWG ENAMEL ON 1 4 m DlA CERAMIC SLUG TUNED FORM L2-2T NO. 22 AWG ENAMEL ON BOTTOM COLO END) OF Lr Tl-MIN MIKE XFMR-LAFAYETTE NO 99E60345 T2-M N MOD XFMR-LAFAYETTE TYPE AR S2 Fig. J. Modulator - Laiayette Cat. No. 99E90375. Parts Ql RCA SK3019 CI 22 pF C2 50 pF RFC Z-50 LI 10T No. 22 enamel on Ya in. iron core, ceramic slug tuned. L2 2T No. 22...

Aircraft Radio

Receiver Circuit Operation Power

It is undoubtedly true that without the aid of radio, aerial navigation would not have advanced to the stage where giant airliners arrive and depart keeping time schedules unheard of only a few years ago. As a matter of fact the airplane is rapidly closing in on such proven means of transport as trains, ships and buses in regards to exact time schedules in all sorts of weather. It is a recognized fact that the actual value of aircraft radio installations depends entirely upon radio facilities...

Free Gonset Gsb-100 Manual

Gonset 213 Image

Wn have Jots more Test Equlpt Ash WE ALSO BUYI WHAT 00 YOU HAVE Rax 122CGC i r y Willi, Calif. 90213 Phone Aren 213, oHee 272-5707, messages 275-5347 it Price 2 per 25 words tor non-commcrcial ads 5 per 25 words for business ventures. No display ads or agency discount. Include your check with order. it Price 2 per 25 words tor non-commcrcial ads 5 per 25 words for business ventures. No display ads or agency discount. Include your check with order. Type copy. Phrase and punctuate exactly as you...

Miniature Test Laboratory

Amateur Lab Pics

RF Signal Generator AF Signal Generator Resistance Substitution Capacitance Substitution Self Powered 1W* x 3* x 3 ' liilbs, Thanks to transistors and printed circuits you can hold this complete lab in one hand. Not long ago this would have been a whole shelf full of test equipment. 455 khz generator for aligning if's, 400 hz generator for audio circuits. Plus a normal VOM and R& C substitution. Field Strength meter for tuning transmitters. Everything in one small boxl Model SE-400 Mini-Lab...

Wintronix Model Induced Wave Form Analyzer

This unit, in conjunction with your present oscilloscope, permits you to view wavje forms in the range from audio thru MHz without any direct connection. The probe is simply placed over the tube in question and the wave form is displayed on the oscilloscope. It may also be used as a high gain amplifier to Increase 'oscope sensitivity. Excellent for T.V., radio, amplifier, and transmitter repair and maintenance. BRAND NEW, WITH PROBE. PRICE 19.95 ea. HP 524 COUNTER without plug in EXCELLENT...

Ham Radio Station Rege Dvorsky

These guys are preparing to launch an ATV rocket that will eventually land amidst a herd of cows. See page 64 for the details. A iongwire tuner for use on land or at sea The perfect The COY2M3EL Stealth VHF Yagi A 144 MHz antenna from Swiech Communications Systems KT2B r s like home liiere right here im iti offices 1 I fust lake advantage nl uut FEEDBACK list on PlIP 17 You'll notice k fbedhuck numbei .M Ehe beginning ofetdi article .util column We d 111. - h to nw ix hat you read so itnu wc...

Two Tone Paging Encoder

Programmable Divider With 74192

TS-1 Sub-Audible Encoder-Decoder Microminiature in size. 1.25 x 2.0'x .65 Encodes and decodes simultaneously 59.95 complete with K-1 element TS-1 JR Sub-Audible Encoder-Decoder Microminiature version of the TS-1 measuring just 1.0* x 1 25 x .65 for handheld units 79.95 complete with K-1 element ME-3 Sub-Audible Encoder Microminiature in size, measures 45 x 1.1 x 6 Instant start-up 29.95 complete with K-1 element TE-8 Eight-Tone Sub-Audible Encoder Measures 2.6 x 2.0* x .7 Frequency selection...

8p6kx John Webster

Build Meter Yagi

Around 11 15 am and my antenna was blown away, I then put my equipment into cases to try to protect it from the rain. Shortly after, I heard the top of my house breaking away and my cousin who was on the top floor was calling for help He was not hurt but afraid, and t told him to come clown below, which he did Things were flying all about outside by this time, and it was dangerous to be outside We put some boards and things on a bed so that in case of debris falling from the top of the house we...

New Series of Microwave Sweep Oscillators with Flexible Modulation and Leveling

In microwave work one of the valuable and inherently appealing test instruments is the microwave sweep generator. Such generators can greatly simplify difficult microwave investigations, as discussed in several past articles on sweep-frequency techniques. A new series of microwave sweep oscillators has now been designed which incorporates a number of new conveniences. These oscillators, especially when used with some of the advanced components recently developed in the -hp laboratories1, make...

Radar Detector Gunn -gun

Waveguide circulator 10-GHz transceiver. 73 Amateur Radio January, 1987 It's not very hard to set up a station for 10 GHz. I have been experimenting with a portion o a Solfan Doppler-radar intrusion alarm that I converted for use at 10.250 GHz. These alarms can be found pretty easily at hamfests, and I have heard many people speak of the high availability of these units in Europe, where this type of alarm circuit is used extensively. I have found two different types. Whatever unit you...

The Autodyne Converter Circuit Using A Na As A Mixer

Transistor Autodyne

Signal from the collector to the emitter causing oscillation. Capacitor G tunes the oscillator circuit to a frequency 455 kc. higher than that of the incoming signal. The local oscillator signal is inductively coupled into the emitter circuit of the transistor. The incoming signal is resonated in T2 and coupled via a low impedance winding to the base circuit. Notice that the base is biased by a voltage divider circuit much the same as is used in audio frequency operation. The two signals are...

Bilal Isotron Antennas

Bilal Isotron

Isotron antennas, designed and manufactured by the Bilal Company, employ a unique new embodiment of a full-size harmonic antenna which permits the radio amateur who has limited space to get on the air from an apartment, condominium, mobile home, or other space-limited environments, There are no compromises in matching or tuning Isotron antennas to your transmitter. This unique design allows direct feed with standard coaxial cable and does away with the need for radiais. How is it that an...

Bilal Isotron

Antenas Isotron

When Ihe box arrived in my office last Wednesday, i remember thinking Even Ralph Biial couldn't fit a 40-meter anienna into a package only 33 x 6Yz x 3. . . why, that's smaller than the boxes most model airplanes come in Ralph had promised to send me the latest version of this Isotron 40, a small, versatile antenna designed for limited spaces such as apartments, condos, campers, and Ihe like where it is almost impossible, for either legal or physical reasons, to put up a lull-sized antenna,...

Sotron Solution For The Meter Band

Small 160 Meter Antenna

Since the opening of the 160-meter band to amateur use, the 1,8-band-selector position on my FT 102 has been gathering dust. Like a number of hams, I simply do nol have space to put up a 252-foot-plus wire antenna for 160 meters. Even if space was available I doubt if I would consider a wire antenna because of the difficulty I had in getting permission to put up my 5-band vertical at my apartment. It would be nice if there was a zero-space antenna for the 160-meter band Baltimore, Maryland, is...

Power Amplifiers

PREAMPLIFIER BUILT-IN PX PfifCE MML 144 30-LS 144MH 30 Wfttl HI AMP il 9 00 MML 144 100-LS 144 MHz tOO Watt HT AMP 332 00 MML 144 200-S 1-14 MHz 2 0 Wall GflAsFE r 395 0G MML 433 30-1 432 MHz 30 W.inHf AMI 32.00 MML 432 100 432 MHz 100 Walt ATV SSB FM395 00 MML 432 50 i V MHr ' U Watr tQWatl lri 204 OB MML 1296 i29bMHi T5 Watts CALL MMC T44 6-HP 2 rr G AsFET MMC 432 28-S 0 L oa i tti l rr MMK 1296 14 eniCB - 1,-H -i .r - 4EfAK - -f

Antenna Noise Bridge Detector

Noise Bridge

Tune your antenna, then measure its radiation pattern with this pocket-sized instrument J, Frank Brumbaugh KB4ZGC Box 30 - c o Defend in i Salinas PR 00751 Using an antenna noise bridge is one of the best and simplest means of measuring antenna characteristics. It is invaluable for tuning an antenna, especially a beam, to resonance at a desired frequency. Normal ihe station receiver is used with the noise bridge as a detector to indicate die resonant frequency of the antenna, and the...

Set of Design Tools

At this time a set of design tools Fig. 1 was in place that allowed the designer to create relatively large circuits. The set contains three editors for entry of data. ED is a general-purpose text editor. ICS is a graphics editor used for the design of masks. DRAW is also a graphical editor but is used for schematic data entry rather than entering mask data. Both DRAW and ICS are described in other articles in this issue. Fig. 1 also shows the various simulators. SUPREM is a process-level...

Swan Astro Ssb Transceiver

Swan Astro 150

Swan is backt After a several year hiatus, during which little was heard from the company, Swan has returned to amateur radio with an impressive array of all-new, state-of-the-art equipment. Swan, for those who have short memories, was a dominant force in amateur gear in the late '60s and early 70s. I was one of thousands of young hams of that era who yearned to own a Swan rig, but my high school and college finances never gave me that opportunity. That's one reason I jumped at the chance to...

Toroid Coil In Hf Radio

Shema Toroid Coil Oscilator For

Flavorig 73 Amateur Radio November, 1989 sistor and its associated components , and replacing it with separate oscillator and mixer stages. With FETs and simple toroid coils, it's as easy as pie Flavorig is an 80-meter, Novice band 5 watt CW transceiver, built around a Radio Shack Fiavoradio , which sells for 6.95. It includes an RIT circuit, sidetone, and minikey, and it operates on 10-14 volts, making it ideal for portable use. As much of the original radio as possible is used. In...

By Peter Traneus Anderson KCHR

Digital Down Converter Block Diagram

This article describes a simple SSB receiver using the new Harris HSP50016GC-52 Digital Down Converter DDC .1 The DDC is a complete Weaver-method receiver implemented digitally in one CMOS chip,2-3 A simple SSB receiver using the DDC needs only an RF A D converter, an audio D A converter, and a source of configuration bits. When combined with a good A D and a DSP, the DDC can perform all functions of a modern high-performance HF communications receiver. The present version of the DDC is limited...

Mrf901 Oscillator

1979 Ham Radios

Shown in I ig. 2 a is representative of the MDS receive system as described m this construction article. This system consists of a mixer, voltage controlled local oscillator and i-f amplifier located at the antenna, and the com bination power supply tuning unit, located at the TV set. The RG-59 U feed line then performs the dual purpose of carrying the i-f signal down the line to the TV and carrying the power supply tuning voltage up the line to the converter. This results in a nice, cheap, and...

Watts Pep Ssb Linear Amplifier

NOW 800 WATTS PEP FOR ONLY M64.95 THE BEST BUY* YET NEW modern styling NEW high efficiency 3 element band-switching pi net. Puts more power Into any antenna or food from 50-70 ohms. For SSB, DSB, Linear AM, PM, CW and FSK. Alt bands 80-10 meters. May be driven lo 800 WATTS PEP SSB with popular 100 watt SSB exciters. Uses four modified 1625's in grounded grid. On customers order, will be furnished with 837's, (note 1625's and 837's are not directly interchangeable, since sockets are different.)...

Satellite Products Division

Inside Ca. 800 352-2553 Outside CA. 800 421-2533 Boman Industries offers complete Satellite Television Systems designed specifically for - installation by the purchaser. You will receive broadcasts from Geostationary satellite with your choice of 3 DIFFERENT Fiberglas -Parabolic Antennas 9,lO, 11 ft. The elec tronics are the latest in Satellite TV eauip ment utilizing state-of-the-art component and circuit design. A fully illustrated instruc tion booklet is supplied with each system t ' explain...

Mew Air Force Tech Manuals

52-19 Antenna Systems 1,50 52-11 Aircraft Sheet Metal Maintenance 1.50 101-6 Airborne Shoran SI.50 102-4 Ground Shoran 1.50 25 Position Stepping Switches, automatic electric type. 45 Unew KY-65 ARA-26 Keyer, article pg 66 apr 62 used, exc APX 6 Transponder GET ON 212 mc used, exc S19.95 APX-6 Conversion Pamphlet , SI.50 ARN-5 Glide Path Revs. freq. 326- 3mc, xtal controlled, omplete w tfr 6 relays Gr 11 tubei Used exc cond. 4.75 BC'348 Rcvr. freq. 200-500 kc amp K5-1S mc. Used, exc cond ,,...

Cityzonestate

1 t I I I I 1 I I I I I I I I 1 I I I I I I A Versatile Automatic Keyer From Surplus Numerous amateur applications exist for an automatic CW keyer that will, on activation, send a predetermined transmission at a preset rate of speed. Just such a device was developed for use aboard military aircraft and was designed to automatically transmit a distress message from the normal aircraft transmitter. The complete equipment is nomen-clatured Control Keyer Group, AN ARA-26, and consists of Keyer,...

Those Fabulous Fifties

Receiver Hro

C Stewart Gitlmor W1FK Spencer Road Higganum C 7 i 64 if Of course, you remember your old rigs, but what was everybody else using 25 years ago I have two different dream station s from 25 years ago One was pictured on the cover of the 25 lt T ARRL pamphlet, How to Become a Radio Amateur It showed a youth sitting in a room that was plastered with QSL cards. Apparently everything the kid needed in order to get those QSL cards was on the desk in front of him A little home-built two-tube receiver...

We Ve Moved

BOX 5C 7 WAN NUYSTCA 9140a l-a 18-904-0524 CIRCLE 1 i J S READER SERVICE CARD THE HAM S ALL-PURPOSE, 0N-THE> R0AD SURVIVAL KIT Ah, a ham's life isn't easy. A DXpedition to a desert island one month VHF contesting on a mountaintop the next Over the years, while on the road, hams have been sunburned, frozen, bitten, scratched, mauled, scraped, crushed and. in some instances, even shot at. Yes. indeed, an easy life it ain't. I don't know if Indiana Jones was a ham. but it wouldn't surprise...

Tranzistor Ruh60

On the cover Carefully installed antennas and cables let Andrew Moore NV1B enjoy mobile CW and 2 meter FM without the distractions of safety hazards or messy looking wires. The choice of multiple narrowbanded 40 meter resonators and a trunk-mounted coax switch provide good bandwidth while eliminating high wind loads and antenna tuners. In classic OM form. NV1B sneaked out of the house on the morning of his wedding day to capture a little of New Hampshire's famous fail foliage atop Stratham Hitl...

Relative RF Power Meter

Diagram Amature Radio

Add this handy device to your shack's arsenal. The Relative RF Power Meter shown in Photo A is a. piece of test equipment useful for tuning RF circuits to maximum output power. The circuit does not measure absolute power, however it instead measures the relative output power as the RF circuit is tuned. When the meter shows maximum deflection, the output power is peaked. The meter has been tested from 2 MHz to I GHz over an input power range of approximately -10 dBm (0.1 mW) to 20 dBm (100 mW)....

Communications Electronics

P.O. 8ox 1045 Ann Arbor, Michigan48106-1CM5U.S.A For orders call 313-973-0860 or FAX 313-971-6000 Photo C. View of the piggy-bach MOSTEK microprocessor with the touchtone decoder. Tone Decoded LED is in the foreground. CES continued from p 14 to the phone line. A six-foot cable with a modular plug comes with the unit. There are two circuits in this unit not found in many autopatches. One is a VOX circuit that detects when the person on the phone is talking. This varies the sample rate in...

Electronic Equipment Bank

The Electronic Equipment Sank is offering a new, expanded 1992 catalog. Wilh a new professional format, this catalog covers shortwave, amateur and scanner radios, and aiso inciudes pages of accessories, hundreds of books,, and a new specialty hi-iech section. The catalog is free (bulk rate mail) in the U.S., 2 in Canada, and S3 elsewhere. Contact EES, 323 Mill Street. N lr Vienna VA 22180 (800) 368-3270, (703) 938-3350t FAX (703) 938-6911. Or circle Reader Service No. 205.

Shinwa Pocket Pagers

The fire department hazardous materials response teams and police department SWAT crews that need reliable radio alerting systems, stake their lives on Shinwa. We offer a two-rone pocket pagerwilh monitor feature and even a voice storage option at an affordable price. To order, we need your paging frequency as we I a s to ne re e d treq e nci es. For o h e r confi gur a tio ns or two-way radio information, please fax us your specifications to 313-663-8888 or phone 313-996-8888. list price...

Breezeshooters Hamfest

Drake Schematic

View Park near Pittsburg, PsL KW WARRIOR linear amplifier. 150. DX-100 09. Add for crating. Will ship KEA collect. Phone 201-7 7-1090. W2QNJ), 176 Winding Way South, Little Silver, N. J* WANTED Miscellaneous units and manual or schematics for Navy transmitters AN SRT14, 15 or 16. Also unmodified prop pitch motors, John McDermott* Box S( Stratford, Conn. DRAKE 2B 20 hours use. Must sdl to settle estate. First check for 175 takes it. Lea Grinspnon W3BDE, 1900...

Inside Todays Kit

Drake Schematic

An interview with Marshall Emm N1FN. (remember the first kit built It was a 40-meter DC receiver I had no idea how the circuits worked. The building in itself fascinated me. start a radio company today, what are the top three items you would advise them to prepare for in the business NIFN In order disappointment, disappointment, and success. Seriously. go lo the local community college and take Business 101. A business is a business, and it doesn't matter whether it is a radio company or a...